Спутник ДЗЗ. DESDynI. [Редактировать]

Дополнительные наименования

#НаименованияПоиск в новостяхПоиск в документах
1DESDynIНайтиНайти
2Deformation, Ecosystem Structure, and Dynamics of IceНайтиНайти

Дополнительная классификация

#Наименования
1Все спутники ДЗЗ

Найдено 303 документов по запросу «DESDynI». [Перейти к поиску]


Дата загрузки: 2016-11-23
Скачать документ
Скачать текст
0.27/5
DESDynI Lidar for Solid Earth Applications ...-As part of the NASA's DESDynI mission, global elevation profiles from... the primary objective of the DESDyni-Lidar is the recovery of... the moderate resolution multi-beam DESDynI-Lidar into processing of SAR... an excellent setting for testing DESDyni capabilities to recover fundamental parameters... DESDyni-Lidar calculated ground tracks (Fig. 1). We used a single pass of DESDynI... terrace surfaces (I·IV) and the DESDynI-Lidar (NE-SW) ground tracks... laser energy, we generated pseudo-DESDynI waveforms from the last return... of even the medium footprint DESDynI-Lidar data over the standard... the Sullivan anticline. Additionally, the DESDynI-Lidar derived elevation profiles will... images. A. Centroid elevations along jive DESDynI-Lidar ground tracks The centroid... waveform has been simulated assuming DESDynI-like parameters for the observations... optimum orientation for future roughly N-S DESDynI-Lidar ground tracks (Fig. 1). The... Bay. The significance of the DESDynI-Udar simulations is that surface... hard to discern in the DESDynI-Udar elevation profiles. B. Future steps... the terraces To simulate the DESDynI-Lidar waveforms from aircraft point... systems such as LVIS and DESDynI-Lidar is that is it... EARTHQUAKE As summarized in the DESDynI Science Definition Document, "in areas... above, we simulated waveforms along DESDynI-Lidar ground tracks over the... great earthquakes with just one DESDynI-Udar pass assuming a 5 laser beam...-earthquake DEM along with the DESDynI Udar over the region. Alternatively... Report of the DESDynI Applications Workshop [11]. V. SUMMARY Since DESDynI-Lidar would...-slip event in southern Alaska, DESDynI-Udar could provide new and... off-nadir pointing to previous DESDynI-Udar transects. We have found... Lidar as part of the DESDynI mission. REFERENCES [1] J.B. Blair, J. Ranson, R. Dubayah... Structure, and Dynamics of Ice (DESDynI), A NASA Mission in the NRC..., and J. Rundle, Report of the DESDynI Application Workshop, 2009. 4



Дата загрузки: 2016-11-23
Скачать документ
Скачать текст
0.21/5
DESDYNI LIDAR FOR SOLID EARTH APPLICATIONS J.... the primary objective of the DESDynI-Lidar is recovery of the... earlier study we generated pseudo DESDynI waveforms with high correlation (Figure... point cloud data to generate a DESDynI like waveforms and a modified post... an excellent setting for testing DESDynI capabilities to recover fundamental parameters... optimum orientation for future roughly N-S DESDynI-Lidar ground tracks. The terraces... the NCALM data along the DESDynI-Lidar calculated ground tracks. An... EARTHQUAKE As summarized in the DESDynI Science Definition Document, “in areas.... Here we simulated waveforms along DESDynI-Lidar ground tracks before and... “after” waveforms. For the future DESDynI -Lidar acquisitions, we will need... Report of the DESDynI Applications Workshop11. 5. SUMMARY Since DESDynI-Lidar would penetrate...-slip event in southern Alaska, DESDynI-Lidar could provide new and... some offnadir pointing to previous DESDynI-Lidar transects. We have found... Lidar as part of the DESDynI mission. 6. REFERENCES [1] J.B. Blair, J. Ranson, R. Dubayah...]DESDynI Science Study Group, Deformation, Ecosystem Structure, and Dynamics of Ice (DESDynI..., and J. Rundle, Report of the DESDynI Application Workshop, 2009.



Дата загрузки: 2016-11-23
Скачать документ
Скачать текст
0.17/5
PolInSAR Methods For Ecosystem Science 2011 Carbon Cycle & Ecosystems Joint Meeting 1 Introduction & Motivation !!Ecosystem structure scientists (especially on ESWG) exposed frequently to PolInSAR via DESDynI !!Considerable uncertainty about efficacy of PolInSAR led to no ecosystem requirements on the InSAR segment of previous DESDynI mission !! !! !! !! Lack of US ecosystem community experience with polInSAR Lack of peer-reviewed papers Lack of access to airborne and field data sets to assess utility Great worry over temporal decorrelation 2 Introduction & Motivation !!DESDynI Science Steering Group (DSSG) and broader ESWG recognized the potential of PolInSAR !! Terrestrial Ecology funded exploration of algorithm development and field experiments (UAVSAR/LVIS joint deployments). !!Discussion about a potential joint PolInSAR mission with DLR (TANDEM-L) with previous DESDynI mission !! Development of draft science requirements !! Draft statement from AGU 2010 meeting "! “The Ecosystem Structure team strongly supports the pursuit of Tandem-L in the DESDynI Project” 3 Introduction & Motivation !!Cancellation of DESDynI lidar unfortunate and helped motivate the present meeting !! “Our community’s options for structural measurements in the near!! term have been much constrained during the past year, and we need to be able to understand and assess our remaining options.” Community examining potential/efficacy of ICESAT2 for vegetation structure -> great uncertainty !!Progress on potential joint missions (e.g. BIOMASS & TANDEML) predicated on mutual understanding and comprehension !!Joint science meeting is long overdue !! Potential joint experiment would be be exceptionally useful !!First step in all these activities is exposure of US ecosystem community to potential of PolInSAR 4 NASA’s Proposed DESDynI* Mission Radar designs for proposed DESDynI mission being studied in pre-Phase A TDRSS downlink L-band 5-80 MHz BW Quad-pol Radar 9-15 m mesh reflector 12-24 element transmit and receive array 12-24 dual-pol receive channels 180-360 km swath, full res, full-pol Better than -25 dB NES0 at 20 MHz BW !"#$"%&'()("*+,-./0,&1(#2,3%34*.($4-5245-*1(/&6("%&/.723(,+('2*( Pre-decisional – for Planning and Discussion Purposes Only! January 2011 MCR DESDynI Concept Must be re-thought Due to Current OMB Direction L-band Polarimetric SAR ? Ecosystem Structure Canopy Height! Biomass! Biomass, Vegetation Structure, Effects of changing climate on habitats and CO2,, disturbance ? ? ? Multibeam Profiling LIDAR Cryosphere Ice velocity, thickness Response of ice sheets to climate change & sea level rise L-band Repeat Pass InSAR Solid Earth Surface Deformation Geo-Hazards Water Resource Management 91-day repeat ~370 km orbit 25 m spot 5 beams Pass 1 Pass 2 Two spacecraft not at same scale ? 13 day repeat ?~600 km orbit 250-500 m orbit control ? 220 km swath Full resolution over swath MHz modes ? 5,20+5,40,80 SP, DP, QQP, QP modes 3 -6 Outlook for DESDynI •! President’s FY12 Budget Proposal (February 2011) reset the go- forward plan for DESDynI –! Lidar mission to be contributed, not funded by NASA –! Radar mission to be implemented more affordably •! NASA continues to invest in DESDynI –! Forming a Science Definition Team –! Continuing trade studies at JPL •! NASA is currently exploring options for reducing cost –! Reducing number and scope of science requirements levied on DESDynI ! DESDynI in combination with other satellites to approach DESDynI requirements –! Find international partners interested in the science and technology ! Ongoing Tandem-L studies with DLR ! Ongoing discussions with several potential partners –! Find domestic partners that would increase utility of DESDynI data 7 Possibilities with PolInSAR – an SRTM analogy •! Prior to SRTM, most users were familiar with quality and character of topography derived from optical stereo •! Despite a concerted effort, attempts to produce uniform high-quality global topography were unsuccessful •! SRTM was selected as a practical alternative to previously attempted methods to fill the gap in global topography –! Sponsors recognized that the data characteristics would be different from optical stereo •! SRTM is now a widely used data sets for science and applications –! Some of its unique qualities (e.g. “electrical height”) are being exploited for canopy height and biomass studies •! Similarly, PolInSAR may be able to fill a gap in global estimates of above-ground biomass and forest structure •! PolInSAR is an extension of SRTM techniques, estimating a number of heights in the canopy to infer structure. 8



Дата загрузки: 2017-02-23
Скачать документ
Скачать текст
Скачать перевод
Посмотреть билингву
0.12/5
... the earthquake cycle GPS InSAR (DESDynI) Geophysical Sensor Web Portlet Summary... Database Interferogram Fault Data 20 DESDynI Mission Deformation, Ecosystem Structure, and...-height accuracy of 1 m Observation Techniques DESDynI is defined by the decadal... is on Deformation Objectives for DESDynI Determine the likelihood of earthquakes... modes High data volumes for DESDynI drive new paradigm for data... QuakeSim to DESDynI Mission Design Measurement Requirements Validate that DESDynI will meet the science objectives Assess the quality of DESDynI... sensitivity analysis Data Volume for DESDynI DESDynI data volume is an order... Expansion factor is 5.2 for all DESDynI data products Processed data 29... Can Serve as Prototype for DESDynI Data Processing We are deploying... operational TeraGrid Supercomputing Resources 30 DESDynI Deformation Data Analysis QuakeSim integrates... Will provide computational infrastructure for DESDynI data analysis and interpretation GeoFEST... End-to-End Flow Data DESDynI InSAR Data HPC Processing Center... deformation InSAR portion of the DESDynI mission Developing Grid services with...



Дата загрузки: 2016-11-23
Скачать документ
Скачать текст
0.2/5
... Radar Processing Concepts for the DESDynI Mission Yunling Lou, Steve Chien... June, 2010 Arlington, Virginia 1 Agenda •  DESDynI mission measurements overview •  Benefits of... of onboard products •  Future work 2 DESDynI Mission Measurements Overview Polarimetric SAR... Repeat Pass InSAR Pass 2 Pass 1 DESDynI will exploit an L-band polarimetric... Dynamics Changes in Earth’s Surface DESDynI ‐ Deforma/on, Ecosystem Structure, and... Advantages of Onboard Processing for DESDynI Mission   DESDynI Radar is an L-band... of Onboard Processing Technology for DESDynI Mission Solid Earth Desired Repeat... for DESDynI Mission’s Radar Instrument Onboard Processor Onboard Autonomy Software DESDynI Analyze...



Дата загрузки: 2017-06-14
Скачать документ
Скачать текст
0.22/5
... become available with NASA’s planned DESDynI sensor. However, substantial challenges remain... Structure, and Dynamics of Ice (DESDynI), http://desdyni.jpl.nasa. gov/ [Donnellan... globe. The mission concept for DESDynI envisions a combination of LiDAR sensors... the transects that ICESAT and DESDynI data are, or will be... expected from a spaceborne mission, like DESDynI. The question is if the... systems, such as the proposed DESDynI sensor, thus have the potential... active remote sensors, such as DESDynI. The resolutions at which these... the sensor used (LiDAR, Landsat, DESDynI, etc.), our study highlights the... structure, and dynamics of ice (DESDynI), in Proceedings of IEEE Aerospace...



Дата загрузки: 2017-09-24
Скачать документ
Скачать текст
0.31/5
DESDynI Pre-Project Study Team Jet ... 11 February 2009 ✦  DESDynI Mission Sciences ❑  ❑  ❑  ✦  15m reflector S/C bus DESDynI Instrumentation ❑  ❑  ❑  ✦  Deformation... precision orbit determination and reconstructions DESDynI Implementation Challenges ❑  ❑  ❑  ❑  ❑  ❑  Accommodating multi-beam...) ❑  MCR Project Documents (Sep 2009) DESDynI – 2 ✦  Perform pre-phase A study with.../GSFC concurrent design/costing capabilities DESDynI – 3 Conduct application workshops for community... be in collaboration with DLR DESDynI – 4 Payload InSAR, Lidar, GPS Orbit... January 12-15, 2009 LIDAR DESDynI – 55 Lidar Free-Flyer Ultra... w/ margin) January 12-15, 2009 DESDynI – 66 Lidar Free-Flyer Ultra...-15, 2009 Radar Free-Flyers DESDynI – 77 RADAR Reflector: 15m diameter... UAVSAR antenna as basis for DESDynI feed; needs engineering and packaging... and a wall thickness of 2.5mm DESDynI – 8 Titanium Flexures HOMER Laser •  Breadboard... requirement for repeat-pass InSAR DESDynI – 10 ✦  Early requirements and designs... as matured Results documented ❑  ❑  DESDynI Website – desdyni.jpl.nasa.gov, to capture... for unreleased documents DESDynI – 11 Meetings and Workshops Held ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  ✦  DESDynI/TanDEM Technical Interchange Meeting (TIM) @JPL 4/7-8/08 DESDynI Working Group Meeting @ GSFC 6/5-6/08 DESDynI/TanDEM TIM @DLR 6/5-6/08 DLR Science Meeting 6/9/08 DESDynI/TanDEM TIM @Boston, following IGARSS 7/17-19/08 DESDynI Science/Working Group Meeting @Greenbelt 10/14-15/08 DESDynI... or consider putting DESDynI lidar on ICESat-II platform DESDynI Application Workshop... from multi-agency application users DESDynI/TanDEM TIM and Science Meeting... instrument 11/17-11/21 DESDynI/TanDEM TIM @JPL 1/8-9/09 TEAM... LIDAR platform 1/26-29/09 DESDynI – 12 DESDynI – 13 Lidar off-pointing... SAR NASA/DLR DESDynI/TanDEM-L TIM-6 1/8-9/08 ICESAT/DESDynI Meeting 10/16... 9/24/09 KDP-A 1/15/10 DESDynI – 14 ✦  Single (with gimbaled lidar... of MCR products, reduce risk DESDynI – 15 ✦  Opportunities for joint development... Design and architecture of SMAP, DESDynI, SWOT, (XOVWM) radar hardware ♦  ♦  Principal... missions such as DESDynI, SWOT, HyspIRI, LIST. ❑  ❑  SWOT and DESDynI: possible shared... Radar and lidar data fusion DESDynI – 16 ✦  What is StripSAR? ❑  ❑  ❑  ✦  Standard... beam DESDynI – 20 ✦  Instrument development technical activities Mission (~Launch) SMAP (13) DESDynI... activities Mission (Launch?) SMAP (13) DESDynI (15) DFS (17) SWOT (17... or ice motion Vegetation structure DESDynI 23– 23 ✦  Pre-Phase Study... from NPR 7120.5D WBS) DESDynI Pre-Project Study 1.0 Study Management... platforms (radaronly and lidar-only) DESDynI – 24 ✦  ✦  Per NASA Procedure Requirement... Report Project and Program Recommendations DESDynI implementation schedule (to be assessed...-39 months Phase E: 60 months DESDynI – 25 Configuration and Concept Features... (Mbps) 160/170/200 400 DESDynI – 26 Configuration •  Lasers, Telescope, Gyro... reflector S/C bus X LIDAR Radar Feed DESDynI – 27 Features of the Instrument...



Дата загрузки: 2017-03-18
Скачать документ
Скачать текст
Скачать перевод
Посмотреть билингву
0.06/5
... Structure, and Dynamics of Ice (DESDynI) Radar satellite. Two climate-focused... will be completed for the DESDynI mission, with the NASA effort... for the Lidar element. The DESDynI launch date will be determined...-B and initiate the spacecraft contract; - DESDynI will complete its Phase A formulation... 2016, respectively. A third Tier I mission, DESDynI, will complete its pre-formulation...-2. The launch plans for the DESDynI mission will be informed by...) and complete its confirmation review; - DESDynI will complete its pre-Phase... Structure, and Dynamics of Ice (DESDynI) The DESDynI mission is a Tier-1 decadal... two separate spacecraft. The overall DESDynI radar/lidar mission will greatly... pre-formulation activities for the DESDynI mission, with the studies focused... manages OSTM, ACRIMSat, SMAP, QuikSCAT, DESDynI, CLARREO, and Jason. Project Management... TBD ICESat-2 GSFC GSFC TBD DESDynI JPL JPL, GSFC TBD CLARREO...



Дата загрузки: 2017-06-14
Скачать документ
Скачать текст
0.09/5
AN OVERVIEW OF THE DESDYNI MISSION Jon Ranson , Paul Rosen2, Ralph Dubayah3, Bradford Hager4 Ian Joughin5, Scott Luthcke1, Bryan Blair1, Scott Hensley2, Yuhsyen Shen2 , Gerry Daelemans1 1 NASA/Goddard Space Flight Center, Greenbelt MD, 2Jet Propulsion Laboratory, Pasadena, CA 3University of Maryland, College Park, Maryland, Massachusetts Institute of Technology, Boston, MA, 5University of Washington, Seattle, WA, 1 In 2007, NASA received directions from the National Academy of Science through its report “Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond” report to launch a mission to study the Earth’s forested ecosystems, ice sheets and glaciers and areas prone to volcanoes and earth quakes. Earth’s land surface is constantly changing and interacting with its interior and atmosphere. In response to the interior, plate tectonics deform the surface, causing earthquakes, volcanoes, mountain building, and erosion, which includes landslides. These events can be violent and damaging. Human and natural forces are rapidly modifying the global distribution and structure of terrestrial ecosystems on which all of life depends, causing steep reductions in species diversity, endangering sustainability, altering the global carbon cycle and affecting our climate now and for the foreseeable future. Our ice sheets, sea ice, and glaciers are key indicators of these climate effects and have themselves been undergoing dramatic changes. The primary mission objectives for DESDynI are to: 1) Determine the likelihood of earthquakes, volcanic eruptions, and landslides through deformation monitoring; 2) Characterize the global distribution and changes of vegetation aboveground biomass and ecosystem structure related to the global carbon cycle, climate and biodiversity; and 3) Predict the response of ice masses to climate change and impact on sea level. In addition, DESDynI would provide observations that would greatly improve our monitoring of groundwater, hydrocarbon, and sequestered CO2 reservoirs. DESDynI will be the first mission to systematically and globally study the solid Earth, the ice masses, and ecosystems, all of which are sparsely sampled at present. Two complementary technologies are planned for DESDynI ( Donellan et al, 2008) : an L-Band Synthetic Aperture Radar (SAR) will be used as an interferometer to measure small deformations of the Earth surface related to below ground processes and dynamics of ice. A Multi-Beam LiDAR will provide a dense sampling of forest structure parameters that can produce accurate estimates of biomass and vertical canopy structure ( Houghton and Goetz 2008). In addition the LiDAR can provide accurate sampling of ground and ice surface elevations useful for solid earth and cryosphere science. The L-band SAR will also be used in multi-polarimetric mode to provide a mapping capability for forest disturbance, regrowth and areas of low biomass. A unique feature of DESDYnI is the joint use or fusion of LiDAR and SAR in pursuit of multidisciplinary science objectives. This invited, session-opening presentation will provide an overview of the DESDYnI mission including science objectives, science requirements for the solid earth deformation, ecosystem structure and dynamics of ice elements and the mission concept,. The presentations in this invited session will discuss concepts and results of this capailbity for all three disciplines. Figure 1 illustrates the DESDYnI mission concept. Ice and solid InSAR measurements detect surface deformation dynamics. References Donnellan, A., H Zebker, KJ Ranson. 2008. Radar and Lidar Measurement of Terrestrial Processes. Eos, Transactions American Geophysical Union, Vol. 89, No. 38, AGU Houghton, R. A. and S. J. Goetz,. 2008. New Satellites Help Quantify Carbon Sources and Sinks.2008. Eos, Vol. 89, No. 43, 21 October 2008



Дата загрузки: 2017-06-15
Скачать документ
Скачать текст
0.09/5
DESDYNI – A NASA MISSION FOR ECOSYSTEMS, SOLID ... (DESDynI) mission among the highest priorities for new NASA Earth missions. DESDynI... for vegetation canopy structure characterization. DESDynI addresses many of the scientific... species habitats and atmospheric CO2. DESDynI measurements will also facilitate the.... 1. INTRODUCTION The InSAR component of DESDynI can be satisfied by a traditional.... Key challenges addressed by the DESDynI team involve trade-offs between... approaches for ionospheric correction. 2. INSTRUMENTS DESDynI’s instruments consist of an L-band... the ecosystem science objectives of DESDynI, but may be used for.... Table 1. Radar operating modes for DESDynI Mode Application Strip Map (single... that we believe meets all DESDynI’s science objectives including those of... 2. Table 2. Strawman Mission Design for DESDynI Parameter Value Orbit altiude 600... currently under study. Radar The DESDynI radar instrument is an L-band... Institute of Technology. interferometry. The DESDynI team is currently working with... most quiet at dawn. Some DESDynI radar data will be affected... and 6 pm observation times of DESDynI. SweepSAR At present, spaceborne synthetic... technologies to their limit. The DESDyni team is studying an alternative... echo. Current performance estimates for DESDynI SweepSAR modes are compared with... or onboard processing. Lidar The DESDynI Lidar instrument is a multiple-beam... and structure of forest canopy. DESDynI’s multi-beam lidar will sample... ecosystems on a grid pattern. 3. CONCLUSIONS DESDynI will be the first mission... Structure, and Dynamics of Ice (DESDynI), Proc. EUSAR 2008, Friedrichshafen, Germany...